Abstract: A shuttle body 3 having aloop seizing beak 10 for seizing a needle thread 9 is rotatably attached to a shuttle race body 2, pressed by a driver 4, and continuously rotated in a rotation direction B in synchronization with vertical motion of a needle 8. A bobbin case 5 in which a bobbin thread 12 wound around a bobbin 5 is accommodated is attached to the shuttle body 3. Under a state where the bobbin thread 12 is pulled out from the bobbin case 5, the shuttle body 3 is rotated, the needle thread 9 is seized by the loop seizing beak 10, the loop of the needle thread 9 is expanded along the outer face of the shuttle body 3, the loop of the needle thread 9 is passed over the shuttle body 3 and the bobbin case 5 so that the shuttle body 3 and the bobbin case 5 are passed through the loop of the needle thread 9, whereby the needle thread 9 is wound around the bobbin thread 12 and a stitch can be formed.

Abstract: An automatic sewing machine control device in which the movement of the presser unit which takes place while the thread take-up lever moves from the bottom dead point to the top dead point is minimized thereby to increase the tension of the upper thread. Even when the load weight applied to a bi-axial drive mechanism increases or the thickness of the sewing material changes, excellent seams can be formed. In a control device for an automatic sewing machine, a start timing unit is provided which starts the bi-axial drive mechanism with respective timing modes. A plurality of drive control data for a drive motor and stepping motors are stored in memory unit which correspond to the load weights applied to the bi-axial drive mechanism and the thicknesses of materials to be sewed.